This is the Aqua Lung AXIOM I3 BC/BCD with FLS Fast Lock System Scuba Diving BC/BCD Features: The knife shown in the picture is only for illustration purpose. Knife is NOT included in the product. SureLock II Mechanical Weight Release System (patented) - provides a safe, single-pull release. Inserting weight is as simple as insert and click. With SureLock, your weights are secure in the BC. Once engaged, the only way to release the weight is to pull on the handle The pull down oral inflator is easy to deploy, use and stow A bladder retraction system is used to pull in the sides of the bladder during deflation. This keeps unit streamlined and reduces drag An adjustable chest strap can be raised or lowered on a rail system. This not only ensures a good fit but also keeps strap from running across top of a drysuit valve A clever octo-pocket on the right lobe secures the octopus while keeping it accessible and visible throughout the dive A scooped instrument pocket (or octo-pocket) is also on the top front of the left lobe, giving versatility of use The Axiom i3 with F.A.S.T. Lock System is latest in luxury, jacket style BC that incorporates Aqua Lung's patented i3 inflation /deflation system. Utilizing the F.A.S.T. Lock System (Front Access Secure Tank) which allows the tank strap to click into position, securing the cylinder. Its amazing comfort and stability come from the integrated Wrapture Harness System. The Axiom is made from durable, fade-resistant materials and comes in a black/charcoal color combination. The F.A.S.T. Lock System Tank Band (Pat. Pend) is a strong, secure way to attach the cylinder to the BC. Gone are the days of complicated web weaving through multi-slot buckles. Located in the front of the BC, the strap simply clicks into place and the buckle is locked closed